Device for measuring the speed of the fluid in the annular space of a steam generator

Abstract

A device for measuring the flow rate of a fluid in the annular space of a steam generator; having within a probe housing, kept fixed relative to the outer wall of the steam generator, a probe. A seal between the probe and the probe housing is formed by an elastic bellows fitted in such a way that it constantly applies one end of the probe against the inner wall of the generator.

What is claimed is: 
     
       1. A device for measuring the flow rate of a fluid in an annular space of a steam generator, said space being limited by an inner ferrule and an outer ferrule, said device comprising: a probe housing, means for keeping said housing fixed with respect to the outer ferrule, a probe placed within said housing, an elastic bellows surrounding the probe and having a first end fixed to the probe and another end fixed to said probe housing, said bellows being fitted so as to constantly apply an end of the probe to the inner ferrule. 
     
     
       2. A device according to claim 1 comprising an instrumentation boss fixed to the outer ferrule at an opening therein, the boss having an opening for the passage of the probe. 
     
     
       3. A device according to claim 2, comprising means for fixing the probe housing to the instrumentation boss. 
     
     
       4. A device according to claim 3 wherein said fixing means comprises a stuffing box for maintaining the probe housing within a recess in the instrumentation boss. 
     
     
       5. A device according to claim 1, wherein the probe comprises, in the vicinity of said end applied to the inner ferrule, a plurality of pressure connection orifices arranged between the inner ferrule and the outer ferrule. 
     
     
       6. A device according to claim 5, wherein said probe has a plurality of passages for connecting each of the pressure connection orifices to a discharge port.